Determination of the Higgs CP mixing angle in the tau decay channels at the LHC including the Drell-Yan background

Abstract

We investigate how precisely the CP nature of the 125 GeV Higgs boson resonance h can be unraveled at the LHC in its decays to tau pairs. We use a method which allows to determine the scalar-pseudoscalar Higgs mixing angle in this decay mode. This mixing angle can be extracted from the distribution of a signed angle, which we analyze for the major charged-prong tau decays. For definiteness, we consider Higgs-boson production by gluon fusion at NLO QCD. We take into account also the irreducible background from Drell-Yan production at NLO QCD. We compute, for the signal and background reactions, angular and energy correlations of the charged prongs and analyze which type of cuts suppress the Drell-Yan background. An important feature of this background is that its contribution to the distribution of our observable is a flat line, also at NLO QCD. By separating the Drell-Yan events into two different sets, two different non-trivial distributions are obtained. Based on this observation we propose to use these sets for calibation purposes. By Monte Carlo simulation we study also the effect of measurement uncertainties on this distribution. We estimate that the Higgs mixing angle can be determined with our method to a precision of 14 degree (5 degree) at the high luminosity LHC (14 TeV) with an integrated luminosity of 500 inverse fb (3 inverse ab).

27 pages, 11 figures, 1 table; journal version

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• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• New parton distributions for collider physics
• An NNLO subtraction formalism in hadron collisions and its application to Higgs boson production at the LHC
• MCFM for the Tevatron and the LHC
• Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs
• NNLO predictions for the Higgs boson signal in the H->WW->lnu lnu and H->ZZ->4l decay channels
• Next-to-Leading order Higgs + 2 jet production via gluon fusion
• Aspects of CP violation in the HZZ coupling at the LHC
• Determining the CP properties of the Higgs boson
• Determining the CP parity of Higgs bosons at the LHC in their tau decay channels
• Determining the CP parity of Higgs bosons at the LHC in the $\tau$ to 1-prong decay channels
• Measuring the Higgs-Vector boson Couplings at Linear $e^{+}{e}^{-}$ Collider
• Role of polarization in probing anomalous gauge interactions of the Higgs boson

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• Scalar mass dependence of angular variables in $t\bar{t}\varphi$ production
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• Testing CP-violation in a Heavy Higgs Sector at CLIC